package com.dog.basics.security.util;

import cn.hutool.core.collection.CollUtil;
import lombok.extern.log4j.Log4j2;
import org.springframework.util.Base64Utils;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.InputStream;
import java.util.Map;
import java.util.Random;

/**
 * @program: pillow
 *
 * @description: 验证码图片
 *
 * @author: Guo
 *
 * @create: 2019-12-02 10:02
 **/
@Log4j2
public class VerifyImageUtil {

	private static int BOLD = 5;

	private static final String IMG_FILE_TYPE = "jpg";

	private static final String TEMP_IMG_FILE_TYPE = "png";

	/**
	 * 根据模板切图
	 *
	 * @param templateFile
	 * @param targetFile
	 * @return
	 * @throws Exception
	 */
	public static Map< String, Object > pictureTemplatesCut(InputStream templateFile, InputStream targetFile) throws Exception {
		Map < String, Object > pictureMap = CollUtil.newHashMap();
		// 模板图
		BufferedImage imageTemplate = ImageIO.read(templateFile);
		int templateWidth = imageTemplate.getWidth();
		int templateHeight = imageTemplate.getHeight();

		// 原图
		BufferedImage oriImage = ImageIO.read(targetFile);
		int oriImageWidth = oriImage.getWidth();
		int oriImageHeight = oriImage.getHeight();

		// 随机生成抠图坐标X,Y
		// X轴距离右端targetWidth Y轴距离底部targetHeight以上
		Random random = new Random();
		int widthRandom = random.nextInt(oriImageWidth - 2 * templateWidth) + templateWidth;
		// int heightRandom = 1;
		int heightRandom = random.nextInt(oriImageHeight - templateHeight);
		//log.info("原图大小{} x {},随机生成的坐标 X,Y 为（{}，{}）", oriImageWidth, oriImageHeight, widthRandom, heightRandom);

		// 新建一个和模板一样大小的图像，TYPE_4BYTE_ABGR表示具有8位RGBA颜色分量的图像，正常取imageTemplate.getType()
		BufferedImage newImage = new BufferedImage(templateWidth, templateHeight, imageTemplate.getType());
		// 得到画笔对象
		Graphics2D graphics = newImage.createGraphics();
		// 如果需要生成RGB格式，需要做如下配置,Transparency 设置透明
		newImage = graphics.getDeviceConfiguration().createCompatibleImage(templateWidth, templateHeight,
				Transparency.TRANSLUCENT);

		// 新建的图像根据模板颜色赋值,源图生成遮罩
		cutByTemplate(oriImage, imageTemplate, newImage, widthRandom, heightRandom);

		// 设置“抗锯齿”的属性
		graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		graphics.setStroke(new BasicStroke(BOLD, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
		graphics.drawImage(newImage, 0, 0, null);
		graphics.dispose();

		ByteArrayOutputStream newImageOs = new ByteArrayOutputStream();// 新建流。
		ImageIO.write(newImage, TEMP_IMG_FILE_TYPE, newImageOs);// 利用ImageIO类提供的write方法，将bi以png图片的数据模式写入流。

		ByteArrayOutputStream oriImagesOs = new ByteArrayOutputStream();// 新建流。
		ImageIO.write(oriImage, IMG_FILE_TYPE, oriImagesOs);// 利用ImageIO类提供的write方法，将bi以jpg图片的数据模式写入流。

		pictureMap.put("slidingImage", Base64Utils.encodeToString(newImageOs.toByteArray()));
		pictureMap.put("backImage", Base64Utils.encodeToString(oriImagesOs.toByteArray()));
		pictureMap.put("xWidth", widthRandom);
		pictureMap.put("yHeight", heightRandom);
		return pictureMap;
	}

	/**
	 * 添加水印
	 *
	 * @param oriImage
	 */
	/*
	 * private static BufferedImage addWatermark(BufferedImage oriImage) throws IOException { Graphics2D graphics2D =
	 * oriImage.createGraphics(); graphics2D .setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints
	 * .VALUE_INTERPOLATION_BILINEAR); // 设置水印文字颜色 graphics2D.setColor(Color.BLUE); // 设置水印文字Font graphics2D.setFont(new
	 * java.awt.Font("宋体", java.awt.Font.BOLD, 50)); // 设置水印文字透明度 graphics2D.setComposite
	 * (AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.5f)); // 第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y)
	 * graphics2D.drawString("zhoujin@qq.com", 400,300); graphics2D.dispose(); //释放 return oriImage; }
	 */

	/**
	 * @param oriImage 原图
	 * @param templateImage 模板图
	 * @param newImage 新抠出的小图
	 * @param x 随机扣取坐标X
	 * @param y 随机扣取坐标y
	 * @throws Exception
	 */
	private static void cutByTemplate(BufferedImage oriImage, BufferedImage templateImage, BufferedImage newImage,
			int x, int y) {
		// 临时数组遍历用于高斯模糊存周边像素值
		int[][] martrix = new int[3][3];
		int[] values = new int[9];

		int xLength = templateImage.getWidth();
		int yLength = templateImage.getHeight();
		// 模板图像宽度
		for (int i = 0; i < xLength; i++) {
			// 模板图片高度
			for (int j = 0; j < yLength; j++) {
				// 如果模板图像当前像素点不是透明色 copy源文件信息到目标图片中
				int rgb = templateImage.getRGB(i, j);
				if (rgb < 0) {
					newImage.setRGB(i, j, oriImage.getRGB(x + i, y + j));

					// 抠图区域高斯模糊
					readPixel(oriImage, x + i, y + j, values);
					fillMatrix(martrix, values);
					oriImage.setRGB(x + i, y + j, avgMatrix(martrix));
				}

				// 防止数组越界判断
				if (i == (xLength - 1) || j == (yLength - 1)) {
					continue;
				}
				int rightRgb = templateImage.getRGB(i + 1, j);
				int downRgb = templateImage.getRGB(i, j + 1);
				// 描边处理，,取带像素和无像素的界点，判断该点是不是临界轮廓点,如果是设置该坐标像素是白色
				if ((rgb >= 0 && rightRgb < 0) || (rgb < 0 && rightRgb >= 0) || (rgb >= 0 && downRgb < 0)
						|| (rgb < 0 && downRgb >= 0)) {
					newImage.setRGB(i, j, Color.yellow.getRGB());
					oriImage.setRGB(x + i, y + j, Color.darkGray.getRGB());
				}
			}
		}
	}

	private static void readPixel(BufferedImage img, int x, int y, int[] pixels) {
		int xStart = x - 1;
		int yStart = y - 1;
		int current = 0;
		for (int i = xStart; i < 3 + xStart; i++) {
			for (int j = yStart; j < 3 + yStart; j++) {
				int tx = i;
				if (tx < 0) {
					tx = -tx;

				}
				else if (tx >= img.getWidth()) {
					tx = x;
				}
				int ty = j;
				if (ty < 0) {
					ty = -ty;
				}
				else if (ty >= img.getHeight()) {
					ty = y;
				}
				pixels[current++] = img.getRGB(tx, ty);

			}
		}
	}

	private static void fillMatrix(int[][] matrix, int[] values) {
		int filled = 0;
		for (int i = 0; i < matrix.length; i++) {
			int[] x = matrix[i];
			for (int j = 0; j < x.length; j++) {
				x[j] = values[filled++];
			}
		}
	}

	private static int avgMatrix(int[][] matrix) {
		int r = 0;
		int g = 0;
		int b = 0;
		for (int i = 0; i < matrix.length; i++) {
			int[] x = matrix[i];
			for (int j = 0; j < x.length; j++) {
				if (j == 1) {
					continue;
				}
				Color c = new Color(x[j]);
				r += c.getRed();
				g += c.getGreen();
				b += c.getBlue();
			}
		}
		return new Color(r / 8, g / 8, b / 8).getRGB();
	}
}
